Fuel atomizer for diesel engines with air supply



Sept 30, 1930. I ou s I 1,776, 812

,FUEL ATOIIZER FOR DIESEL ENGINES WITH A11! SUPPLY Fileid March 9, 1927 Patented Sept. 30, 1930 UNITED STATES PATENT OFFICE.

MARTIN LOUIS, OF KIEL, GERMANY, ASSIGNOR T0 FRIED. KRUPP GEBMANIAWERFT AKTIENGESELLSCHAFT, OF KIEL-GAARDEN, GERMANY FUEL ATOMIZER FOR DIESEL ENGINES WITH AIR SUPPLY Application filed March 9, 1927, Serial No. 174,043, and in Germany April 10, 1926.

The invention relates to fuel atomizers of the type described in my co-pendingpatent application Ser. No. 126,912, filed August 3rd, 1926.

The essential feature characterizing the fuel atomizer of the mother patent application consists in the fact, that the admission of the fuel to the current of injection air takes place in the seat of the fuel needle and is controlled by the needle itself. This fuel atomizer, however, is destined for engines the fuel valve of which is arranged vertically. With engines the fuel valves of which are arranged in'an inclined or horizontal position, this design cannot be employed forthwith, as in this case the fuel would not remain in the compartment provided for it.

Now my present invention has for its object to adapt the fuel atomizer of my abovementioned copending patent application to horizontal or inclined arrangement. This object is obtained by the fact, that the fuel is magazined in a chamber located above the horizontally or inclinedly arranged fuel ncedle, the lower portion of this chamber being in communication with an annular channel from which extend the bores leading to the needle seat, whilst its upper portion is in communication with the air compartment of the fuel valve. 7

In order to allow of my new invention to be more easily understood, a preferred embodiment of same is illustrated in the drawing which accompanies and forms part of this specification, the drawing showing a horizontally arranged fuel valve'in vertical section.

The valve body A includes an air compartment a into which opens the inlet port a for the injection air. while the supply of the fuel takes place through the supply duct a An inserted valve member C forms the seat for the fuel needle B and shuts off the air compartment a. It is held in place together with a nozzle plate D located in front of it, by a screw cap E screwed on the valve body A. The fuel needle B is guided in an extension 0 of the valve member C, bores being provided in the extension 0 for the passage of the air to the needle seat.

When the needle B assumes its opening position, the air compartment a is in communication with the interior of the engine cylinder (not shown) through the bore 0 of valve member C, bore (1 of nozzle plate D, and bore e of screw cap E. The fuel supply duct a leads to an annular groove 0 provided in the valve member C and from which radial bores 0" lead through the valve member C to the seat of the fuel needle B. Besides, the. annular space a is in communication through a channel a* with a chamber a serving to store the fuel.

A small tube G-inserted in the wall of the air compartment (1 and projecting into the fuel chamber a connects these two rooms. The screw H serves to tightly close the bore required for the insertion of tube G.

The operation of my'novel fuel atomizer is as follows:

Before the injection period the fuel pump supplies fuel through the duct a to the annular groove 0 and bores 0*, and, on the other hand, through channel a to chamber a serving-as a magazine, wherein the fuel raises to a cer-tainlevel that depends on the quantity supplied, but must not exceed the upper edge of tube G. The air arrives througlrthe admission ports a in the air compartment a and through the tube'G in the magazine 5 above the fuel contained therein. Upon lifting now the fuel needle B from its seat, the air flows through the bores of the extension 0' and then with great speed and considerable decrease of pressure past the point of needle B. An increased pressure is thus provoked in the magazine (1L relatively to the place where the fuel is withdrawn therefrom, this pressure causing the fuel contained in a to be pressed through bore a", annular groove 0 and bores 0 into the escaping air current which takes the fuel along with it and atomizes it into the engine cylinder.

The described arrangement affords a fuel injection valve which is reliable in service even with inclined and horizontal valves and fulfills all conditions pointed out in the mother patent application.

What I claim as my invention and desire to secure by Letters Patent, is

1. In a fuel atomizer for Diesel engines, a needle valve arranged in a substantially horizontal position, said valve. including a valve seat and a needle adaptedto be seated in said seat, means for'supplying injection air to the valve, a fuel admission duct in the wall of and opening into said seat and adapted to be controlled by said needle, a fuel compartment arranged above said needle, a communication between the lower portion of said fuel compartment and said fuel admission duct, and a communication between the upper portion thereof and said air supplying means.

2. In a fuel atomizer for Diesel engines, a needle valve arranged in a substantially horizontal position, said valve including a valve seat and a needle adapted to be seated in said seat, means for supplying injection air to the valve, a fuel admission duct in the wall of and opening into said seat and adapted to be controlled by said needle, a fuel compartment arranged above said needle, a com munication between the lower portion of said fuel compartment and said fuel admission duct, and a communication between the-upper portion thereof and said air supplying means, said first-named communication having a smaller sectional area than said lastnamed communication.

3. In a fuel atomizer for Diesel engines, a needle valve arranged in a substantially horizontal position, said valve including a valve seat and a needle adapted to be seated in said seat, a chamber for injection air and a fuel admission duct in the wall of and opening into said seat and adapted to be controlled by said needle, a fuel compartment from which said fuel duct leads, located above and separated by a wall from said air chamber, and an air tube extending from said chamber through said wall to a point above the maximum fuel levelin said compartment.

4 In a fuel atomizer for Diesel engines, a needle valve arranged in a substantially horizontal position, said valve including a needle, a valve seat member having a needle seat therein, an annular groove on. the outside of said member, a duct extending from said groove to said seat, a fuel compartment arranged above said valve, a connection between the inner portion of said fuel compartment and one side of said groove, a fuel supply duct, a communication between said supply duct and the other side of said groove, means for supplying injection air to said valve, anda communication between the upper portion of said compartment and said air supplying means.

5. In a fuel atomizer for Diesel engines, a needle valve arranged in a substantially horizontal position, said valve, including a needle, a valve seat member having a needle seat therein, an extension on said valve member, a chamber in said extension adjacent said valve seat, said needle being supported in said extension and passing through said chamber, a fuel admission duct in the wall of said valve member and opening into said seat, a fuel compartment arranged above said valve, a communication between the lower portion of said compartment and said duct, means for supplying injection air to said chamber, and a communication between the upper part of said fuelcompartment and said air supplying means.

The foregoing specification signed at Hamburg, Germany, this tenth day of February,

MARTIN LOUIS. 

